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Intel's integrated graphics chipset (Napa) which has two ways to control the video:

Operating system direct control.

Video driver control.

While Vista is booting, the operating system will use its own built in process to control the video output. As the operating system is booting, it will initiate the video driver and transfer control of the video output to the Intel video driver. When the video device is initialized, user may observe several white lines flashing across the screen for a moment.

Solution

This behavior is caused by a video device initialization. It is not a cause for concern, and there is no functional problem.